You could get rid of the "If this effect is activated, you cannot attack this turn" clause since it's pretty harsh, especially since it implies you cannot conduct your Battle Phase at all that turn. Other than that, I see it's balanced by now. It's no Judgment Dragon, but it's definitely handy.
Also, try looking for "Magic Set Editor". It's much better than the custom card website, in my opinion, since the text doesn't get microscopic if you include too much. At first the card names won't show up in the right font, but you can fix that. There's posts addressing it on the program's patron forums.